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Plate Tectonics Vocabulary

Across
A technique used to date materials, such as rocks and carbon.
The outermost part of the Earth, comprising the crust and the uppermost part of the mantle
The boundary between two oceanic crusts. The collision causes one oceanic plate to move underneath the other, forming trenches and a line of volcanos and islands.
The boundary between two tectonic plates moving away from each other, creating rift valleys on land, new ocean crusts on sea floors, and mountainous ridges.
The theory that the lithosphere is divided into tectonic plates that slowly move on top of the asthenosphere
The solid layer with plasticity in the upper mantle, located just below the lithosphere. Lithospheric plates “float” and move on this layer.
Down
Occurs when two tectonic plates move towards each other and collide
The crust at the bottom of a sea or ocean
The place where two different plates make contact
Occurs when two tectonic plates slide past each other